Electric battery.



UNITED STATES PATENT OFFICE.

LLOYD R. RHOADES, OF FREMONT, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO

NATIONAL CARBON COMPANY, INC., A CORPORATION OF NEW YORK.

ELECTRIC BATTERY.

To all whom it may (0710mm lie it known that I, More R. l-luoiions. a #:itizen oi the limited Flatt-s, rwaiding at Fremont, in the county oi Sandushy and State of Ohio, have invented a certain new and u eful luiprorounnt in lliertriw Bat teries, oil which the following is a. lull, elrar, and exat't description.

My invention relates to elertri batteries, and more particularly to bibuions linings for so-called dry cells.

As is well known, a dry LUll Consists of a zine can with a paper or other hihnlons lining inside oi. \rhieh is ooinpaeted a battery mix around a central elertrode. It has been. the practice to apply a paste of flour and Water or other analogous materials to the hibulous lining before the mix is (amped in the cell. Sometimes this paste has been smeared on the linings by hand and sometimes by applying it with a paint brush.

I have found that much better results are ohtained in dry ells it the flour paste is air plied as a uniform routing by spraying the paste on tho linings. The sprayed (routing is n-et'erabiy dried on the linin; before the latter is placed in the zinc ran. in this Way :1 very uniform mat is obtained and the paste seems to be slightly forced into the pores of the lining! which makes it. adhere to the lining much better than when the paste is brushed. or smeared on.

When a uniform coating is applied to the lining by spraying, as above described, the local notion is redured and the electrolytic act ion during service is uniform throughoutthe surfare of the zinc. \Vhen the llour paste is painted on the lining with a'brush for ex- Specification of Letters Patent.

Application filed January 5, 1918.

Patented July 16, 1918. Serial No. 70,407.

ample, the coating is not uniform and the rorrosion of the zinc seems to depend upon the thickness of the paste, so that the bristle marks are plainly discernible on a zinc electrode after the veil has been placed on the shell for a long enough time to show cor- I'OsiOl].

1 am not sure of the reason for the reduced ('orrosion in dry veils with sprayed coating, and it may be that it; is due to conrentration effects. That is, the concentration in. the thirl; portion of the paste might be different from that in the thin portion, and a difference of voltage would be set up due to such difference in ('oncentration. This would tend to cause corrosion on open circuit, as, well as on dosed circuit. However, regardless of any theory, it has been demon strated to be a fact that the sprayed coating prod uces superior results.

The paste can he sprayed on the linin with any spraying device, such as the usua paint s iirayer. The paste obedmay also be of any desired nature, such as pastes of flour either raw or rooked, meal, cornstarch, etc.

Having desrribed my invention, what I claim is 1. A dry (Lell containing a bibulous lining having a uniform coating of flour and water paste adherent thereto.

2. A dry cell having a lining with a coatingiof flour and water paste uniformly applied to the same and forced into the surface pores.

In testin'iony whereof, I hereunto aflix my signature.

LLOYD R. RHOADES. 

